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Moderate mag. 5.5 earthquake - Macquarie Island, Southern Ocean (Australia) on Tuesday, 1 October 2019 - information

Strong mag. 5.5 Earthquake - South Pacific Ocean, Australia, on Wednesday, Oct 2, 2019, at 06:57 am (GMT +11)

A strong magnitude 5.5 earthquake occurred in the South Pacific Ocean near the coast of  Australia in the early morning of Wednesday, Oct 2, 2019 at 6.57 am local time (GMT +11). The quake had a very shallow depth of 10 km (6 mi) and was reported felt by some people near the epicenter.

Strong mag. 5.5 Earthquake - South Pacific Ocean, Australia, on Wednesday, Oct 2, 2019, at 06:57 am (GMT +11) Strong mag. 5.5 Earthquake - South Pacific Ocean, Australia, on Wednesday, Oct 2, 2019, at 06:57 am (GMT +11)

Strong magnitude 5.5 earthquake at 10 km depth

1 Oct 20:08 UTC: First to report: GeoAu after 11 minutes.
Oct 2 00:34: Magnitude recalculated from 5.3 to 5.5.

Earthquake details

Date & timeOct 1, 2019 19:57:11 UTC
Local time at epicenterWednesday, Oct 2, 2019, at 06:57 am (GMT +11)
StatusConfirmed (manually revised)
Magnitude5.5
Depth10.0 km
Epicenter latitude / longitude55.229°S / 158.28°E South Pacific Ocean, Australia
Seismic antipode55.229°N / 21.72°W
Shaking intensityStrong shaking near epicenter
Felt1 report
Primary data sourceGeoAu (Geoscience Australia )
Estimated seismic energy released1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) | about seismic energy
Interactive map
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Nearby places

User-reports for this quake (1)

We received 1 report for this quake.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Macquarie island / Light shaking (MMI IV) : Was having a coffee in bed when the whole building moved.  

What is Intensity and the Mercalli Intensity Scale?


The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.
Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.
Read more about the MMI scale!

Compare Quake Data

Data for the same earthquake as reported by different agencies

The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag Depth Time GMT
2019-10-1
Epicenter Agency
5.5 10 km
6.2 mi
(*)
19:57:11 Macquarie Island, Southern Ocean (Australia) GeoAu (Geoscience Australia )
5.9 10 km
6.2 mi
(*)
19:57:10 New Zealand (Australia)
13 km (7.8 mi) epicenter difference with GeoAu
GEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
5.4 11 km
6.8 mi
19:57:11 Macquarie Island Region (Australia)
6.4 km (4 mi) epicenter difference with GeoAu
BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
5.3 10 km
6.2 mi
(*)
19:57:11 Macquarie Island Region (Australia)
12 km (7.5 mi) epicenter difference with GeoAu
GFZ (German Research Centre for Geosciences)
5.5 10 km
6.2 mi
(*)
19:57:09 Macquarie Island Region (Australia)
29 km (18 mi) epicenter difference with GeoAu
EMSC (European-Mediterranean Seismological Centre)
5.5 10 km
6.2 mi
(*)
19:57:10 91km SSW of Macquarie Island, Australia
9.1 km (5.6 mi) epicenter difference with GeoAu
USGS (United States Geological Survey)
Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Seismograms

Seismic station: Macquarie Island (MCQ/AU network) | Distance from quake: 92 km / 57 mi | Show on map | Station Info
Seismic station Macquarie Island: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.1-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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Aftershocks for this quake

No aftershocks have been recorded so far. When aftershocks are detected, we will update this section.

What are aftershocks?


Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.
[More info]

What about this quake?


Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface of approx. 32 km2 (=12 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 10 km (6 mi).
[More info]


Recorded aftershocks, latest first (0 quake)

Date and Time GMTMag
Depth
DistanceRegionDetails
Oct 2, 2019 06:57 am (GMT +11)
4 years ago - felt
5.5

10 km
0 km - This quakeSouth Pacific Ocean, Australia
Main Shock (this quake)
More

Map of aftershocks

Earthquake statistics

Average number of earthquakes

Based on data from the past 10 years and our earthquake archive back to 1900, there are about 19 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 7 or higher: 0.02 quakes per year (or 1 quake every 41.7 years)
  • Mag. 6 or higher: 0.06 quakes per year (or 1 quake every 15.6 years)
  • Mag. 5 or higher: 0.37 quakes per year (or 1 quake every 2.7 years)
  • Mag. 4 or higher: 1.35 quakes per year
  • Mag. 3 or higher: 1.45 quakes per year
  • Mag. 2 or higher: 1.45 quakes per year
The area where this quake occurred has a high level of seismic activity. It has had at least 3 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 40 to 45 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

Map of earlier quakes in the area of this quake

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Map to embed or share

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